Android Open Source - spotthestation Image View Activity

• Back to App/server  ↑

From Project

Back to project page spotthestation.

License

The source code is released under:

Apache License

Java Source Code

/*
 * Written by Eleanor Da Fonseca, Weixiong Cen, Harrison Black & Boris Feron
 *//* w ww . j  av  a2 s. c  o m*/

package nasa.android.spotthestation;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.ByteBuffer;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.util.ByteArrayBuffer;
import org.jarjar.apache.commons.codec.binary.Base64;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.Menu;
import android.widget.ImageView;
import android.widget.TextView;

public class ImageViewActivity extends Activity {
  private static final String UPLOAD_IMAGE_URL = "http://matai.aut.ac.nz:8080/NASAControlServer/ImageDownloadServlet?location=";
  private static final int MAX_DOWNLOAD_SIZE = 1024 * 1024; // 1MB
  // Instance variables
  private ImageView imageView;
  private TextView commentTextView;
  private String LOG_TAG = "Test";

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_view);
    imageView = (ImageView) this.findViewById(R.id.imageView);
    commentTextView = (TextView) this.findViewById(R.id.comment);
    Bundle intentData = getIntent().getExtras();
    double latitude = intentData.getDouble("Lat");
    double longitude = intentData.getDouble("Long");
    new DownloadImageDataTask().execute(latitude + "", longitude + "");
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.image_view, menu);
    return true;
  }

  class DownloadImageDataTask extends AsyncTask<String, String, Bitmap> {
    private String comment;

    @Override
    protected Bitmap doInBackground(String... params) {
      Bitmap imageBitmap = null;
      String latitude = params[0];
      String longitude = params[1];
      String url = UPLOAD_IMAGE_URL + latitude + "A" + longitude;
      Log.d(LOG_TAG, url);
      try {
        URL urlObject = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) urlObject.openConnection();
        connection.connect();
        InputStream input = connection.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(input);
        ByteArrayBuffer baf = new ByteArrayBuffer(MAX_DOWNLOAD_SIZE);
        int current = 0;
        while ((current = bis.read()) != -1) {
          baf.append((byte) current);
        }
        byte[] data = baf.buffer();
        // Calculate the number of bytes for the image comment. {0, 0,
        // 0, data value} as 4 bytes are needed to extract an integer
        byte[] commentByteLength = { (byte) 0, (byte) 0, (byte) 0, data[0] };
        ByteBuffer commentByteLengthBuffer = ByteBuffer.wrap(commentByteLength);
        int commentLength = commentByteLengthBuffer.getInt();
        // Obtain comment
        byte[] commentBytes = new byte[commentLength];
        System.arraycopy(data, 1, commentBytes, 0, commentLength);
        comment = new String(Base64.decodeBase64(commentBytes));
        // Obtain image data
        int imageSrcPos = 1 + commentLength;
        byte[] imageData = new byte[data.length - imageSrcPos];
        System.arraycopy(data, imageSrcPos, imageData, 0, data.length - imageSrcPos);
        imageData = Base64.decodeBase64(imageData);
        imageBitmap = BitmapFactory.decodeByteArray(imageData, 0, imageData.length);
      }
      catch (ClientProtocolException e) {
        e.printStackTrace();
        Log.d(LOG_TAG, "ClientProtocolException");
      }
      catch (IOException e) {
        e.printStackTrace();
        Log.d(LOG_TAG, "IOException");
      }
      return imageBitmap;
    }

    @Override
    protected void onPostExecute(Bitmap photo) {
      imageView.setImageBitmap(photo);
      // Update UI
      commentTextView.setText(comment);
    }
  }
}

Java Source Code List

• Back to App/server  ↑